In electronics a NOT gate is more commonly called an inverter. The circle on the symbol is called a bubble, and is used in logic diagrams to indicate a logic negation between the external logic state and the internal logic state (1 to 0 or vice versa).
A weather watch, on the other hand, typically refers to an alert issued to indicate that conditions are favorable for the development of dangerous weather patterns, although the dangerous weather conditions themselves are not currently present.
the development of severe weather, whether it is severe thunderstorms, tornadoes, or flash flooding. When a watch is issued for your area, it is time to take precautions and make sure you are prepared should bad weather strike. WHAT TO LISTEN FOR: Warning: Warnings are issued when severe weather is occurring or imminent. When